Rubber-tip attachment for lead-pencils.



No. 727,398. PATENT'ED MAY 5, 1903.

E. U. MACK. RUBBER TIP ATTACHMENT FOR LEAD PENOILS.

APPLICATION FILED MAR. 10, 1903. N0 MODEL.

Patented May 5, 1903.

OFFICE.

ATENT ERNEST ULMO MACK, OF FLORENCE, SOUTH CAROLINA, ASSIGNOR TO EAGLEPENCIL COMPANY, OF NEW YORK, N. Y.

RUBBER-TIP ATTACHMENT FOR LEAD-PENCILS.

SPECIFICATION forming part of Letters Patent No. 727,398, dated May 5,1903.

Application filed March 10, 1903.

T0 at whom it may concern:

Be it known that I, ERNEST ULMo MACK, of Florence, in the county ofFlorence and State of South Carolina, have invented a new and usefulImprovement in Rubber-Tip Attachments for LeadPencils, of which thefollowing is a specification.

The device in which my invention is comprised consists of a piece oferasive rubber, which is held to the end of the pencil by asupporting-rod, (preferably of metal, such as steel,) which is insertedand fits closely in an opening or channel formed for it in both therubber and end of the pencil.

The characteristic of the invention is that the supporting-rod ismovable lengthwise in both the pencil and the rubber, the advantage ofthis being that while the rod at all times acts to properly uphold andsupport the rubber, yet it can readily be adjusted as the rubber wearsaway. All that is necessary, for example, when the rubber wears down tothe end of the rod is to press the rubber endwise against any hardunyielding surface. By the endwise compression of the rubber the rod isforced down deeper into its channel in the pencil, and the rubber whenpressure is removed from it will expand, so that its outer face will bebeyond the end of the rod. In this way the rubber can be practicallyentirely used up.

In the drawings, to which I shall now refer for a better understandingof my invention, Figure 1 is a perspective view of apencil provided witha rubber tip in accordance with my invention, the pencil being partlybroken away to show the join t between it and the tip. Fig. 2 is alongitudinal axial section of the same.

A is the lead-pencil of any suitable kind.

B is the rubber tip, which may have any desired external configuration.

In both the tip and the rear end of the pencil is formed an axialchannel. That in the tip is lettered b and that in the pencil islettered 0;.

C is a small metal rod with rounded ends,

Serial No. 147,1l4. (No model.)

which fits tightly in both of the channels a and b and serves to holdthe tip and pencil together and to support and to give stiffness to thetip. The end of the tip which fits against the end of the pencil may beundercut or concave to fit against the corresponding convexed end of thepencil, as shown in Fig. 2, or it may be straight and fiat, as inFig. 1. The meeting faces of the tip and pencil can also be gluedtogether, if desired.

The channel a in the pencil can be the ordinary lead-holding channel orgroove, all that is needed being to remove the lead for a sufficientdistance to accommodate the rod 0. The channel a, it should be remarked,is longer than the portion of the rod C which fits in it at the outset,this being for the purpose of affording room for the longitudinalmovement of the rod.

The rod is movable lengthwise in both the pencil and the rubber tip.When the latter wears down to the rod, endwise pressure on the rubberwill compress it and force the rod down farther into the channel a inthe pencil. As soon as pressure is removed the rubber will expand and inso doing will move outwardly, so as to carry its exposed face beyond theend of the rod 0. This operation can be repeated from time to time asoccasion arises until the rubber is practically all used up.

What I claim as'new herein, and desire to secure by Letters Patent, is-

The pencil provided with a longitudinal channel a, a rubber tip providedwith a longitudinal channel b, and a rod C, for uniting the tip and thepencil, tightly fitting, and capable oflengthwise movement,in saidchannels, the channel a, in the pencil, being of greater length than theportion of, the rod which it receives, substantially as and for thepurposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 6th day of March,1903.

ERNEST ULMO MACK. Witnesses:

J. E. SCHOERHOE, F. W. J ONES.

